Emil maurer



` Y PATENTED EEB'. '2 E. MAURER. SPEED REGULATOR. l 'APPLIUATION'VIILED DBO. 11, 1903.

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UNITED STATES vPatented. February 2, 1904.

PATENT OFFICE.

SPEED-REGULATOR.

SPECIFICATION forming` part of Letters Patent No. 751,319, dated February 2, 1904.

l Application filed December 11, 1903,." Serial No. 184,724. (No model.) i

To aZZ whom t may concern:

Be it known that I, EMIL MAURER, a citizen of Switzerland, residing at 'Karolinenthah Austria-Hungary, have invented new and useful Improvements in Speed-Regulators, of which the following is a specification.

This invention relates to a speed-regulator for turbines and other hydraulic motors in which `an efficient regulation with a minimum expenditure of power is obtained.

In the accompanying drawings, Figure lis a front View, partly inl section, of my improved speed-regulator; Fig. 2, a plan thereof; Fig. 3, a longitudinal section through the regulating-valve; Fig. 4, a similar section showing the parts in a different position, and

Fig. 5 a longitudinal section through a modi-- fication of the valve.

The letter a represents a reservoir or chamber containing oil or any other suitable medium for operating the regulator. Chamber a communicates by port a with the interior of a pump-casing Z1. The drawings show a rotary pump, the pistons Z of which may be rotated from the power-shaft in'suitable manner; but a pump of different construction may be used. The casing Z communicates by port Z2 with the port o4 of a valve-box c, containing a hollow slide-valve Z.` Valve-box c has two inner circumferential inlet-channels c c2, with which port c4 communicates by ducts c c7. Intermediate the channels c c2 the valve-box c is provided with a central annular channel c3, which communicates with port 04. The channel c3 is provided with a series of central openings or return-ports c5, that are in alinement with corresponding ports cZ' of slide-A position, Fig. 4, it establishes communication pump andthe leftend of cylinder Z.

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between left inlet-channel c -and left exitchannel cs, and consequently between the In a similar manner the groove Z3 establishes communication between the channels c2 o when the valve is in its extreme left position.

The valve d is provided with two sets of circumferential perforations d* d, of which perforations Z5 are adapted to establish communication between the channel c and the interior of valve Z when the latter is in its eX- treme right position, Fig. 4; In similar manner the openings CZ4 establish communication between channel cs and lthe interior of valve Z when the latter is in its extreme left position. The stem m of valve ZZ engages at m one arm of a bell-crank n, pivoted at a' to valve-box c. The other arm of bell-crank n is by rod o connected at p to a lever p.

The piston g of cylinder Z has piston-rod q', which is connected by links 7T to the crank s of a regulating rock-shaft s. The shaft s is connected in any suitable lmanner to means (not shown) for setting the blades of the tur- In order to prevent overregulation, the shaft s carries a second crank 82; which is connected to one end of a rod u, the other end of which is connectedl at p2 to lever jo.l The lever p is pivot-ed at p3 to the-sleeve o of a centrifugal governor o, driven from the powershaft of the turbine'4 in any suitable manner.

The operation is as follows: vGrovernor fv as well as the pistons ZJ of pump Z) are rotated by the power-shaft of the turbine. As long as the turbine works with its normal speed governor fu is in its normal position, thus holding valve CZ in its central position. In this position openings c are in communication with openings d', so that the oil delivered by the pump through duct c4 into central channel c3 will pass through openings c5 UZ' into the interior of valve d, to be thence returned by through pipe f to chamber (Z. Thus the oil will be freely returned to reservoir a as long as valve Z isin its normal position. If, however, the turbine Works toofast,

-governor o will cause sleeve o' toraise, thus tilting lever p upwardly around pivot p2. The upward movement of lever p will by rod 0 swing bell-crank n so that valve Z will as- IOO sume the right end position. (Shown in Fig. 4.) In this position openings d are out of alinement with openings c5, so that the latter are closed. The channel c communicates by groove Z2 with channel c, while the channel c communicates with interior of valve d through openings d5. Thus the oil passes through duct c, channel c, groove (Z2, channel o8, and pipe g to the left end of cylinder l. The pressure of the oil against left end of piston q will cause the piston to move to the right, which movement will by rod q', links r, and crank s' rock the regulating-shaft s to set the blades of the turbine. The oil contained within the right endof cylinder Zwill by the piston be forced out through pipe L, channel c, openings into the interior of valve 0l, whence it will return to reservoir a through pipe f. The rocking movement of shaft s will by crank pull down rod u, which in turn will cause a downward movement of lever p around pivot p3. This downward movement will push down rod 0 and turn bell-crank n, so that the valve (l is moved inwardly to reassume its central normal position. Ii' the turbine works too slow, the governor will move the valve CZ to its left end position. In this Josition the oienincrs c5 are again out of alinement with openings CZ. The channel c2 will communicate by groove Z3 with channel c, while the channel c will communicate with the interior of valve d through openings (Zi. Thus the oil will pass through duct c7, channel c2, groove cl3, channel c, and pipe l1. to the right of cylinder Z, so as to move the piston q to the'leit and rock shafts in the opposite direction. During this movement of the piston the oil will be forced out from the left end of the cylinder through pipe g, channel c", openings d* into the interior of valve d, and thence back to reservoir a through pipe j.

Fig. 5 illustrates a modification of my regulating-valve, the central annular groove c3 being replaced by two laterally-arranged inner circumferential `return channels or ports 01 c, The valve l has two circumferential grooves or ports d Z7 communicating with channels c1 c, respectively. Between the grooves (Z6d7 and the ends of the valve there are formed circumt'erential ribs Z8 d, that are of a thickness' Z is further provided with two inner ribs LZ1 d, that slightly overlap the exit-channels c8 c when the valve is in its central position. Between ribs d10 du valve d has openings al, that establish acommunication between the exit-channels o8 or 09 and the interior of valve (Z when the valve is shifted to the left or right, respectively, the openings d replacing the two sets of perforations d* d of Fig. 1.

It will be seen that in my improved speedregulator the oil lows without pressure through the pump and valve as long as the governor is in its normal position. Only while the speed of the turbine is being regulated is the oil subjected to pressure. In this way I obtain an eicient regulation with a minimum expenditure of power.

What I claim is- 1. In a speed-regulator, the combination of a reservoir with a' pump, a communicating valve-box having inlet-channels and exit-channels, a valve having grooves adapted to connect said channels, a cylinder having a piston, means for connecting the cylinder at opposite sides of the piston to the exit-channels, and a return-pipe connecting the valve-box with the reservoir, substantially as specified.

2. In a speed-regulator, the combination oi' a reservoir with a pump, .a communicating' valve-box having inlet-channels and exit-channels, a hollow valve having grooves adapted to connect said channels and perforations adapted to register with the exit-channels, a cylinder having a piston, means for connecting the cylinder at opposite sides oi' the piston to the exit-channels, and a return-pipe connecting the valve-box with the reservoir, substantially as specified.

3. In a speed-regulator, the combination of a reservoir with a pump, a communicating valve-box having inlet-ch annels and exit-channels, a valve having grooves adapted to connect said channels, a cylinder having a piston, means for connecting the cylinder at opposite sides of the piston to the exit-channels, a return-pipe connecting the valve-box with the reservoir, a governor controlling' the valve, and a regulating-shaft operatively connected to the piston, substantially as specified.

Signed by me at Prague, Bohemia, Austria- Hungary, this 17th day of November, 1903.

EMIL MAURER.

Witnesses:

RUDOLF SIEGMUND, ADoLrH FISCHER.

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